Trump, in his own bluff way, was trying to get the EUSSR countries, the main beneficiaries of the protection afforded by NATO, to stump up their fair share of the costs. Germany in particular, the reason that NATO was needed in the first place, was in bed with Putin. Buying gas from him and his cronies, and selling it on at vast profit, and doing less than nothing to dissuade his agressive intent(see Crimea). Remember ... Merkell was straight out of the USSR from East Germany. No doubt still under the control of the commie funnies. Corby was too dim to be dangerous, but dangerous enough to create the necessary distractions for the real events to take place. Brexit screwed up the well laid plans hatched in Germany and incubated by the (still) vichy French.